Fuel control system and parts therefor or the like

ABSTRACT

This disclosure relates to a fuel control system for a fuelburning apparatus wherein an electrical switch is adapted to sense the nonignition condition and ignition condition of an electrically operated ignition means for a burner means in such a manner that when the system is initially energized, the switch means effects opening of a first valve means while energizing the ignition means and when the ignition means reaches an ignition condition, the switch means opens a second valve means to permit fuel to flow to the burner means while effectively disconnecting the electrical ignition means from the electrical power source. Such system includes a time delay means which will terminate the operation of the system if after a predetermined time period from the time the first valve means is initially opened, the second valve means does not open.

United States Patent [72] Inventor Arthur L. Good Elkhart, Ind. [21]Appl. No. 743,479 [221 Filed July 9, 1968 [45] Patented Sept. 7, 1971[731 Assignee Robertshaw Controls Company Richmond, Va.

[54] FUEL CONTROL SYSTEM AND PARTS THEREFOR OR THE LIKE 24 Claims, 5Drawing Figs.

431/66 [51] Int. Cl. F23q 9/08 [50] Field of Search 431/45, 66, 67

[56] References Cited UNITED STATES PATENTS 3,338,288 8/1967 Walker431/71 3,488,131 1/1970 Myers etal. 431/69X 3,489,500 1/1970 Giutfridaet a1 431/45 X 3,497,849 2/1970 Place et a1. 337/99 PrimaryExaminer-Carroll B. Dority, Jr. Attorneys-Auzville Jackson, .Ir.,Robert 1. Marben and Candor, Candor & Tassone ABSTRACT: This disclosurerelates to a fuel control system for a fuel-burning apparatus wherein anelectrical switch is adapted to sense the nonignition condition andignition condition of an electrically operated ignition means for aburner means in such a manner that when the system is initiallyenergized, the switch means effects opening of a first valve means whileenergizing the ignition means and when the ignition means reaches anignition condition, the switch means opens a second valve means topermit fuel to flow to the burner means while effectively disconnectingthe electrical ignition means from the electrical power source. Suchsystem includes a time delay means which will terminate the operation ofthe system if after a predetermined time period from the time the firstvalve means is initially opened, the second valve means does not open.

PATENTEUSEP Han 3.603708 sum 2 or 3 nun... 000000 53 77 h 68 J 6| i 6679 78 76 6O 1 73 69 FIG.2

F 3 INVENTOR.

ARTHUR L.GOOD

BY $40M HIS ATTORNEYS PATENTEUSAEP mn- 3.603708 sngnaura FIG. 5

I N VE NTOR. ARTHUR L. GOOD HIS AT TORNEYS FUEL CONTROL SYSTEM AND PARTSTHEREFOR OR THE LIKE This invention relates to an improved fuel controlsystem for a fuel-buming apparatus or the like as well as to an improvedelectrical control system for such an apparatus or the like.

It is well known that fuel-burning apparatus requires an ignition meansfor the main burner means thereof to effectively ignite fuel when thesame first issues from the main burner means and such ignition means canbe automatically operated when the apparatus is initially turned on.

Accordingly, it is a feature of this invention to provide an electricalignition means for such a fuel-burning apparatus wherein the ignitionmeans is automatically energized when the control means is firstactivated with the ignition means thereof thereafter and automaticallycausing the fuel to issue from the main burner means only after theignition means has reached an ignition condition.

Another feature of this invention is to provide a time delay means insuch a system so that after the ignition means is initially energized,full ignition of the burner means must take place within a predeterminedtime period or the time delay means will completely terminate theoperation of the control system.

In particular, one embodiment of this invention provides a fuel controlmeans wherein a source of fuel is interconnected to a burner means by aconduit means having first solenoidoperated valve means therein and asecond solenoid-operated valve means therein disposed intermediate thefirst valve means and the main burner means. The electrical controlsystem is so constructed and arranged that the same comprises a nelectrical switch which when disposed in one position thereof and issensing that the ignition means is at a nonignition condition, theswitch means when initially interconnected to the electrical powersource will only cause opening of the first valve means and theenergizing of the ignition means so that the second valve-means remainsin its closed position to prevent the flow of fuel to the main burnermeans; Thereafter, when the electrical switch means senses an ignitioncondition of the ignition means, the electrical switch not onlymaintains the first valve means while terminating the operation of theignition means to that the subsequently issuing fuel from the mainburner means will be ignited by the ignition means. However, a timedelay means is provided in the system so that if after the initialopening of the first valve means a predetermined time period lapsesbefore the ignition means reaches ignition condition, the time delaymeans opens an electrical switch to effectively disconnect theelectrical control system from the electrical power source.

Accordingly, it is an object of this invention to provide an improvedfuel control system for a fuel burning apparatus or the like the systemof this invention having one or more of the novel features set forthabove or hereinafter shown or described.

Another object of this invention is to provide an improved electricalcontrol means for such a control system or the like.

Other objects, uses and advantages of this invention are apparent from areading of this description which proceeds with :reference to theaccompanying drawings forming a part thereof and wherein:

FIG. 1 is a schematic view illustrating the control system of thisinvention with the control system being disposed in its off 7 trolsystem is initially operated.

FIG. 3 is a view similar to FIG. 2 and illustrates the electricalcircuit after the ignition means has reached ignition condition, theeffective circuit in FIG. 3 being illustrated in bold lines.

FIG. 4 is a view similar to FIG. 2 and illustrates another embodiment ofthe electrical control system of this invention, the circuitillustrating bold lines the effective circuit when the control system isinitially energized.

FIG. 5 is a view similar to FIG. 4 and illustrates the control system ofFIG. 4 after the ignition means has reached ignition condition, theeffective parts of the circuit in FIG. 5 being illustrated by boldlines.

While the various features of this invention are hereinafter describedand illustrated as being particularly adapted to provide acontrol meansfor a fuel burning apparatus, it is to be understood that the variousfeatures of this invention can be utilized singly or in any combinationthereof to provide control means for other types of apparatus asdesired.

Therefore, this invention is not to be limited to only the embodimentsillustrated in the drawings because the drawings are merely utilized toillustrate one of the wide variety of uses of this invention.

Referring now to FIG. l, the improved fuel control system of thisinvention is generally indicated by the reference numeral and comprisesa conduit means 11 adapted to interconnect a fuel source conduit means12 to a main burner means 13 of a fuel-burning apparatus 14 in a mannerhereinafter described, the conduit means 11 having a first valve means15 therein and a second valve means 16 therein intermediate first valvemeans 15 and the burner means 13. In addition, a pressure regulatormeans 17 can be disposed in the conduit means 11 intermediate the firstand second valve means 15 and 16 so as to m maintain a substantiallyconstant pressure to the fuel being directed to the main burner means13.

The valve means 15 comprises a valve member 18 adapted to open and closea valve seat 19 and carrying an armature 20 adapted to be attracted by asolenoid coil 21 so that when the coil 21 is energized in a mannerhereinafter described, the valve member 18 will be moved away from thevalve seat 19 and when the coil 21 is deenergized in a mannerhereinafter described, the valve member 18 will close against the valveseat 19.

Similarly, the second valve means 16 comprises a valve member 22 adaptedto open and close a valve seat 23 and carrying an armature 24 adapted tobe attracted by a solenoid coil 25 so that when the coil 25 is energizedin the manner hereinafter described, the valve member 22 is moved awayfrom the valve seat 23 and when the coil 25 is deenergized in a mannerhereinafter described, the valve member 22 will close against the valveseat 23.

The electrical control system of this invention for operating the fuelcontrol means 10 .is generally indicated by the reference numeral 26 andcomprises a pair of power source leads L" and L adapted to berespectively electrically interconnected to the power source leads L andL after a conventional part of the electrical control means of theapparatus 14 is moved to its on position, the conventional part of theelectrical control means of the apparatus 14 is moved to its onposition, the conventional part of the electrical control means beingcontained within the rectangle dashed 27 in FIG. 1 and now to bedescribed.

The power source lead L" is interconnected to a switch blade 28 of thedryer drum and motor 29 as well as to a lead 30 interconnected to oneside 31 of a light 32 which is disposed inside the dryer 14 to causeillumination therein when the dryer door is in open position, the otherside 33 of the light 32 being interconnected by a lead 34 to a fixedcontact 35. The contact 35 is spaced from another fixed contact 36 and adoor operated switch blade 27 is disposed against the contact 35 whenthe dryer door is opened an when the dryer door is closed, the switchblade 37 is moved against the contact 36.

The power source lead L is electrically interconnected to a switch blade38 that is controlled by a bimetal member 39 so that as long as thetemperature within the dryer 14 does not exceed an unsafe high limittemperature thereof, the bimetal member 39 maintains the switch blade38against an electrical contact 40 that is interconnected to the switchblade 37 by a lead 41.

The fixed contact 36 is interconnected by a lead 42 to a switch blade 43of a manually actuated cycle timer 44 of the apparatus 14 so that whenthe timer 44 is set to an on position by the housewife or the like, thetimer 44 holds the switch blade 43 against a pair of spaced electricalcontacts 45 and 46 to cause the continuous operation of the apparatus 14until the timer 44 reaches its end of cycle position and moves theswitch blade 43 away from the contacts 45 and 46 to terminate theoperation of the apparatus 14 in a conventional manner.

The contact 45 of the cycle timer 44 is interconnected by a lead 47 toone side 48 of the dryer drum and fan motor 29 while the contact 46 ofthe cycle timer 44 is directly interconnected to the power source lead Lof the electrical control system 26 of this invention. The switch blade28 of the dryer motor 29 is adapted to be moved from the positionillustrated in FIG. 1 to be disposed against a fixed contact 49 afterthe motor 29 has been initially energized in a manner conventional inthe art to effectively interconnect the power source lead L" to thepower source lead L of the electrical control means 26 of this inventionso that it can be seen that once the housewife or the like has manuallyset the cycle timer 44 and the dryer door is in its closed position tohold the switch blade 37 against the contact 36, the power source leadL" is electrically interconnected to the power source lead L of thesystem 26 while the power source lead L is interconnected to the powersource lead L of the electrical control system 26 of this invention.

The details of the electrical control system 26 of this invention forcontrolling the fuel control means of this invention will now bedescribed.

Referring now to FIGS. 1 and 2, the power source lead L is directlyinterconnected to a switch blade 50 of a time delay means 51 of thisinvention, the switch blade 50 being bimetallie and normally beingdisposed against a fixed contact 52 that is interconnected by a lead 53to a lead 54 that is interconnected to one side 55 of the solenoid coil21 for the first valve means 15.

The side 56 of the first solenoid coil 21 is interconnected by a lead 57to a pair of leads 58 and 59, the lead 58in turn being interconnected toa pair of leads 60 and 61 and the lead 59 being interconnected to oneside 62 of the second solenoid coil 25.

The other side 63 of the second solenoid coil 25 is interconnected by alead 64 to the power source lead L the power source lead 1., also beinginterconnected by a lead 65 to a fixed contact 66 of an ignition coiland/or flame operated switch means 67. In particular, the switch means67 includes a switch blade 68 which is normally disposed in its closedposition against the fixed contact 66 as well as against another fixedcontact 69 as long as an electrically operated ignition coil 70 for theburner means 13 is not at ignition condition and/or the fuel is notburning at the main burner means 13, such switch blade 68 being operatedby conventional sensing means indicated by the reference numeral 71 inFIGS. 1 and 2 and comprising a temperature sensing bulb and powerelement as desired.

In any event, if the ignition coil 70 is at ignition condition and/orflames exist at the main burner means 13, the sensing means 71 moves theswitch blade 68 to the open position as illustrated in FIG. 3 for apurpose hereinafter described.

The contact 69 of the switch means 67 is interconnected by a lead 72 toone side 73 of the ignition coil 70 while the other side 74 of theignition coil 70 is inter connected by a lead 75 to the juncture of thepreviously described leads 53 and 54.

The previously described lead 61 is interconnected to the switch blade69 of the switch means 67 and the previously described lead 60 isinterconnected to one side 76 of a resistance heater 77 of the timedelay switch means 51, the other side 78 of the resistance heater 77being interconnected directly to the power source lead L by a lead 79 inadvance of the switch blade 50.

The resistance heater 77 is so constructed and arranged that the same isadapted to operate the bimetallic switch blade 50 so that if the heatermeans 77 reaches a predetermined temperature, the same will cause theswitch blade 50 to move away from the fixed contact 52 to effectivelydisconnect the power source lead L from the electrical control means 26of this invention to terminate the operation of the fuel control means10 as will be apparent hereinafter. However, as long as the resistanceheater 77 produces a temperature effect below the previously describedtemperature effect, the bimetallic switch blade 50 remains closedagainst the contact 52.

The operation of the fuel control system of this invention utilizing theelectrical control system 26 of this invention will now be described.

After the housewife or the like manually sets the cycle timer 44 to itson position so as to effectively cause the power source leads L" and Lto be respectively interconnected to the power source leads L and L ofthe electrical means 26 and since the ignition means and heater means 77are at ambient temperature and the valve members 18 and 22 of the firstand second valve means 15 and 16 are disposed in their closed position,the initial energizing of the control system 26 of this invention isillustrated in bold lines in FIG. 2 whereby it can be seen that theclosed switch blade 68 effectively places the first solenoid coil 21,resistance heater 77 and ignition coil 70 in parallel relation acrossthe power source leads L and L while effectively shunting out thesolenoid coil 25 of the second valve means 16 so that the energizedsolenoid coil 21 of the first valve means 15 opens the valve member 18away from the valve seat 19 so that fuel can flow to the second valvemeans 16 but cannot pass therethrough to the main burner means 13. Also,since full line voltage is across the resistance heater 77, theenergized heater 77 begins to heat up and because of a time delay in theheating thereof, the bimetallic switch blade 50 remains closed againstthe contact 52. Simultaneously, the ignition coil 70 is now energizedand begins to heat up to ignition condition.

When the ignition coil 70 subsequently reaches ignition condition, thesensing means 71 opens the switch blade 68 in the manner illustrated inFIG. 3 whereby the opened switch blade 68 effectively disconnects theignition coil 70 from the power source leads L and L and places thesolenoid coil 21 and resistance heater 77 in parallel relation with thatparallel circuit of the solenoid coil 21 and resistance heater 77 beingplaced in series with the solenoid coil 25 across the power source leadsL and L to now energize the solenoid coil 25 so that the second valvemember 22 can be moved away from the valve seat 23 to permit fuel to nowissue from the main burner means 13 and be ignited by the ignition coil70.

The solenoid coil 21 of the first valve means 15 is so constructed andarranged that the same will cause opening of the valve member 18 awayfrom the valve seat 19 if the solenoid coil 21 is at or slightly belowthe line voltage and will only permit the valve member 18 to closeagainst the valve seat 19 when the coil 21 is at or below one-half ofthe line voltage so that it can be seen that when the circuit means 26is in the condition illustrated in FIG. 3, the first valve member 18will remain in its open condition and the voltage across the resistanceheater 77 has been reduced from the voltage provided across theresistance heater 77 when in the condition of FIG. 2 so that theresistance heater 77 cannot now open the blade 50. Also, the solenoidcoil 25 of the second valve means 16 is so constructed and arranged thatthe same will cause opening of the valve member 22 away from the valveseat 23 when the solenoid coil 25 is at its designed voltage and willcause subsequent closing of the valve member 22 against the valve seat23 when the coil 25 has no voltage across the same.

Thus, if the electrical control system 26 now is in a conditionillustrated in FIG. 3, both valve members 18 and 22 are in their openedposition so that the fuel issuing from the burner means 13 can beignited by the ignition coil 70 and once fuel is burning at the mainburner means 13, the sensing means 71 maintains the switch blade 68 inits opened position as illustrated in FIG. 3 so that the burner means 13continues to operate until the cycle timer 44 opens the switch blade 43away from the contacts 45 and 46 to effectively disconnect theelectrical power source from the system 26 whereby the valve members l8and 22 will close against their respective valve seats 19 and 23 toterminate the flow of fuel to the main burner means 13.

However, if during the initial start up of the control system 26 in themanner previously described wherein the ignition coil 70 is not atignition condition and the system is as illustrated in FIG. 2, theignition coil 70 should not heat up to ignition condition in apredetermined time period, the heater means 77 will have heated up tosuch a condition that the same will cause opening of the switch blade 50so as to disconnect the power source from the coil 21 whereby the valvemember 18 will close against the valve seat 19, the opening of theswitch blade 50 also disconnecting the ignition coil 70 from the powersource leads whereby the heater 77 will maintain the valve member 50 inits open position until the timer cycle means 44 is turned off and nofuel can issue from the main burner means 13 during this failure in theignition coil 70 from heating up to ignition condition during thepredetermined time period.

If, after the control system has been properly operated so that the fuelis now issuing from the main burner means and the electrical system 26is in the condition as illustrated in FIG. 3, the housewife or the likeshould temporarily open the dryer door so as to temporarily move theswitch blade 37 away from the contact 36 so as to disconnect the powersource temporarily from the electrical control means 26 of thisinvention, both valve members 18 and 22 will seat against their valveseats 19 and 23 and when the housewife then closes the dryer door toagain close switch blade 37 against the contact 36 and energize thepower source leads L and L before the sensing means 71 closes the switchblade 69 against the contacts 68 and 69, only the valve member 22 of thesecond valve means 16 will be moved to its open condition because withthe system as illustrated in FIG. 3, only a portion of the operatingvoltage is now being placed across the solenoid coil 21 of the firstvalve means so that the same cannot open the valve member 18 away fromthe valve seat 19. However, a continued cooling being sensed by thesensing means 71 subsequently causes the switch blade 69 to move back toits closed position as illustrated in FIG. 2 which will restart theignition cycle by shunting out the coil of the first valve member 16 topermit the valve member 22 thereof to close against the valve seat 23and will place the solenoid coil 21 of the first valve means 15 acrossfull line voltage to open the valve member 18 from the valve seat 19 sothat a normal ignition of the main burner means 13 can take place in themanner previously described.

Therefore, the control system will continue to function in the mannerpreviously described until shut down by the cycle timer means 44reaching its end of cycle position.

If during the normal operation of the control system 10, the switchblade 68 would fail to open from the position illustrated in FIG. 2 tothe position illustrated in FIG. 3 when the ignition coil 70 reachesignition condition, the resistance heater 77 of the time delay switch 51of this invention will open the switch blade 50 so as to remove currentfrom the solenoid coil 21 of the first valve means 15 to permit closingof the valve member :18. against the valve seat 19 in the mannerpreviously As illustrated in FIGS. 4 and 5, the electrical control means26A is substantially identical to the previously described electricalcontrol means 26 of FIGS. 2 and 3 except that the side 62A of the secondsolenoid coil 25A is tapped to the first solenoid coil 21A by a lead 59instead of being interconnected to the juncture of leads 57A and 58A asin the control system 26.

In this manner, the solenoid coil21A is provided with a holding voltageand eliminates the possibility of the second solenoid coil 25A pullingin to open its valve member due to surge of voltage or an accumulationof manufacturing tolerances.

As illustrated in FIG. 4, when the control system 26A is initiallyenergized in the manner previously described, the switch means 67Aeffectively places the first solenoid coil 21A, the time delay heater77A, and ignition coil A in parallel relation across the power sourceleads L and L to cause initial opening of the first valve means whileeffectively shunting out the second solenoid coil 25A for the purposepreviously described. However, when the ignition coil 70A reachesignition condition to cause opening of the switch blade 68A in themanner illustrated in FIG. 5, it can be seen that the resistance heater77A and first coil means 21A are still disposed in series relation withthe second solenoid coil 25A so that the voltage across the resistanceheater 77 drops to prevent opening of the switch blade 50A while thesolenoid coil 25A now pulls in to permit fuel to issue from the mainburner means and be ignited by the ignition means 70A.

Accordingly, not only does this invention provide an improved fuelcontrol system for a fuel burning apparatus or the like but also thisinvention provides improved electrical control means for such a systemof the like.

I claim:

1. In a fuel control system having a source of fuel adapted to beinterconnected by conduit means to a burner means, the improvementcomprising a first valve means in said conduit means for controllingfuel flow therethrough, a second valve means in said conduit means forcontrolling fuel flow therethrough and being disposed intermediate saidfirst valve means and said burner means, and electrically operated meansoperatively interconnected to said valve means so that when saidelectrically operated means is initially energized the same initiallyopens said first valve means while maintaining said second valve meansin its closed position to prevent fuel flow to said burner means, saidelectrically operated means having electrically operated ignition meanswhich when subsequently energized to ignition condition causes openingof said second valve means while holding said first valve means in itsopened position and terminating the effective operation of said ignitionmeans whereby said ignition means ignites fuel issuing from said burnermeans, said electrically operated means having a time delay meanseffectively responsive only to an ineffective operation of said ignitionmeans which will terminate the operation of said control system if saidsecond valve means is not opened in a predetermined time period aftersaid electrically operated means is initially operated.

2. In a fuel control system as set forth in claim 1, said electricallyoperated means having a first solenoid coil for operating said firstvalve means and a second solenoid coil for operating said second valvemeans.

3. In a fuel control system as set forth in claim 2 said electricallyoperated means having an electrical power source and having switch meansplacing said first coil across said power source when said electricallyoperated means is initially energized to cause opening of said firstvalve means.

4. In a fuel control system as set forth in claim 3, said switch meanseffectively shunting out said second coil from said power source whensaid switch means initially places said first coil across said powersource whereby said second valve means remains closed.

5. In a fuel control system having a source of fuel adapted to beinterconnected by conduit means to a burner means, the improvementcomprising a first valve means in said conduit means for controllingfuel flow therethrough, a second valve means in said conduit means forcontrolling fuel flow therethrough and being disposed intermediate saidfirst valve means and said burner means, and electrically operated meansoperatively interconnected to said valve means so that when saidelectrically operated means is initially energized the same initiallyopens said first valve mean while maintaining said second valve means inits closed position to prevent fuel flow to said burner means, saidelectrically operated means having electrically operated ignition manswhich when subsequently energized to ignition condition causes openingof said second valve means while holding said first valve means in itsopened position whereby said ignition mean ignites fuel issuing fromsaid burner means, said electrically operated means having a time delaymeans which will terminate the operation of said control system if saidsecond valve means is not opened in a predetermined time period aftersaid electrically operated means is initially operated, saidelectrically operated means having a first solenoid coil for operatingsaid first valve mans and a second solenoid coil for operating saidsecond valve means, said electrically operated means having anelectrical power source and having switch means placing said first coilacross said power source when said electrically operated means isinitially energized to cause opening of said first valve means, saidswitch means effectively shunting out said second coil from said powersource when said switch means initially places said first coil acrosssaid power source whereby said second valve means remains closed, saidswitch means being adapted to place said first and second coils inseries across said power source when said ignition means is subsequentlyenergized to ignition condition whereby said opened first and secondvalve means permit fuel to issue from said burner means and be ignitedby said ignition means.

6. In a fuel control system having a source offuel adapted to beinterconnected by conduit mans to a burner means, the improvementcomprising a first valve means in said conduit means for controllingfuel flow therethrough, a second valve means in said conduit means forcontrolling fuel flow therethrough and being disposed intermediate saidfirst valve means and said burner means, and electrically operated meansoperatively interconnected to said valve means so that when saidelectrically operated means is initially energized the same initiallyopens said first valve means while maintaining said second valve meansin its closed position to prevent fuel flow to said burner means, saidelectrically operated means having electrically operated ignition meanswhich when subsequently energized to ignition condition causes openingof said second valve means while holding said first valve means in itsopened position whereby said ignition means ignites fuel issuing fromsaid burner means, said electrically operated means having a time delaymeans which will terminate the operation of said control system if saidsecond valve means is not opened in a predetermined time period aftersaid electrically operated means is initially operated, saidelectrically operated means having a first solenoid coil for operatingsaid first valve means and a second solenoid coil for operating saidsecond valve means, said electrically operated means having anelectrical power source and having switch means placing said first coilacross said power source when said electrically operated means isinitially energized to cause opening of said first valve means, saidswitch means effectively shunting out said second coil from said powersource when said switch means initially places said first coil acrosssaid power source whereby said second valve means remains closed, saidswitch means being adapted to place said first and second coils inseries across said power source when said ignition means is subsequentlyenergized to ignition condition whereby said opened first and secondvalve means permit fuel to issue from said burner means and be ignitedby said ignition means, said switch means placing said ignition means inparallel with said first coil across said power source when saidelectrically operated means is initially energized and said ignitionmeans is not at ignition condition.

7. In a fuel control system as set forth in claim 6, said switch meansdisconnecting said ignition means from said power source when saidignition means reaches ignition condition.

8. In a fuel control system as set forth in claim 1, said electricallyoperated means having an electrical power source and first and secondsolenoid coils for respectively operating said first and second valvemeans, said time delay means comprising an electrical switch forconnecting and disconnecting said power source to and from said firstcoil, said electrically operated means placing said first coil acrosssaid power source when said electrically operated means is initiallyenergized to cause opening of said first valve means and to start saidpredetermined time period for said time delay means.

9. In a fuel control system having a source of fuel adapted to beinterconnected by conduit means to a burner means, the improvementcomprising a first valve means in said conduit means for controllingfuel flow therethrough, a second valve means in said conduit means forcontrolling fuel flow therethrough and being disposed intermediate saidfirst valve means in said conduit means for controlling fuel flowtherethrough and being disposed intermediate said first valve means andsaid burner means, and electrically operated means operativelyinterconnected to said valve means so that when said electricallyoperated means is initially energized the same initially opens saidfirst valve means while maintaining said second valve means in itsclosed position to prevent fuel flow to said burner means, saidelectrically operated means having electrically operated ignition meanswhich when subsequently energized to ignition condition causes openingof said second valve means while holding said first valve means in itsopened position whereby said ignition means ignites fuel issuing fromsaid burner means, said electrically operated means having a time delaymeans which will terminate the operation of said control system if saidsecond valve means is not opened in a predetermined time period aftersaid electrically operated means is initially operated, operated, saidelectrically operated means having an electrical power source and firstand second solenoid coils for respectively operating said first andsecond valve means, said time delay means comprising an electricalswitch for connecting and disconnecting said power source to and fromsaid first coil, said electrically operated means placing said firstcoil across said power source when said electrically operated means isinitially energized to cause opening of said first valve means and tostart said predetermined time period for said time delay means, saidtime delay means having an electrical heater for opening said time delayswitch when said heater reaches a predetermined temperature.

10. In a fuel control system as set forth in claim 9, said electricallyoperated means having a switch means that places said heater across saidpower source when said electrically operated means is initiallyenergized and said ignition means is not at ignition condition.

11. In a fuel control system as set forth in claim 10, said switch meanshaving means for sensing the condition of said ignition means wherebywhen said sensing means senses a nonignition condition of said ignitionmeans said switch means is in one position thereof and when said switchmeans senses an ignition condition of said ignition means said switchmeans is in another position thereof.

12. In a fuel control system as set forth in claim 11, said switch meanswhen in said one position thereof placing said ignition means and saidfirst coil in parallel relation across said power source.

13. In a fuel control system as set forth in claim 11, said switch meanswhen in said one position thereof placing said first coil and saidheater in parallel relation across said power source.

14. In a fuel control system as set forth in claim 11, said switch meanswhen in said other position thereof placing said first and second coilsin series across said power source while disconnecting said ignitionmeans from said power source.

15. In a fuel control system as set forth in claim 14, said switch meanswhen in said other position placing said first coil and said heater inparallel relation with said parallel circuit being placed in series withsaid second coil across said power source.

16. An electrical control system for a fuel-burning apparatus or thelike comprising a first solenoid coil for operating a first valve means,a second solenoid coil for operating a second valve means, andelectrically operated means operatively interconnected to said coils sothat when said electrically operated means in initially energized thesame initially energizes said first coil for opening said first valvemeans while maintaining said second coil in a condition to preventopening of said second valve means, said electrically operated meanshaving electrically operated ignition means which when subsequentlyenergized to ignition condition is adapted to cause energizing of saidsecond coil to open said second valve means while holding said firstvalve means in its opened position, said electrically operatedmeanshaving a time delay means which is adapted to terminate the operation ofsaid control system if said second valve means is not opened in apredetermined time period after said electrically operated means isinitially operated, said electrically operated means having twoelectrical power source leads and having switch means adapted to placesaid first coil across said power source leads when said electricallyoperated means is initially energized to cause opening of said firstvalve means, said switch means effectively shunting out said second coilfrom said power source when said switch means initially places saidfirst coil across said power source leads whereby said second valvemeans remains closed, said switch means being adapted to place saidfirst and second coils in series across said power source leads whensaid ignition means is subsequently energized to ignition conditionwhereby said open first valve and second valve means will permit fuel toissue from a burner means of said apparatus and be ignited by saidignition means.

17. An electrical control system for a fuel-burning apparatus or thelike comprising a first solenoid coil for operating a first valve means,a second solenoid coil for operating a second valve means, andelectrically operated means operatively interconnected to said coils sothat when said electrically operated means is initially energized thesame initially energizes said first coil for opening said first valvemeans while maintaining said second coil in a condition to preventopening of said second valve means, said electrically operated meanshaving electrically operated ignition means which when subsequentlyenergized to ignition condition is adapted to cause energizing of saidsecond coil to open said second valve means while holding said firstvalve means in its opened position, said electrically operated meanshaving a time delay means which is adapted to terminate the operation ofsaid control system if said second valve means is not opened in apredetermined time period after said electrically operated means isinitially operated, said electrically operated means having twoelectrical power source leads and having switch means adapted to placesaid first coil across said power source leads when said electricallyoperated means is initially energized to cause opening of said firstvalve means, said switch means effectively shunting out said second oilfrom said power source when said switch means initially places saidfirst coil across said power source leads whereby said second valvemeans remains closed, said switch means being adapted to place saidfirst and second coils in series across said power source leads whensaid ignition means is subsequently energized to ignition conditionwhereby said open first valve and second valve means will permit fuel toissue from a burner means of said apparatus and be ignited by saidignition means, said switch means being adapted to place said ignitionmeans in parallel with said first coil across said power source leadswhen said electrically operated means is initially energized and saidignition means is iii not at ignition condition.

18. An electrical control system as set forth in claim 17, said switchmeans disconnecting said ignition means from said power source when saidignition means reaches ignition condition.

19. An electrical control system for a fuel-burning apparatus or thelike comprising a first solenoid coil for operating a first valve means,a second solenoid coil for operating a second valve means, andelectrically operated means operatively interconnected to said coils sothat when said electrically operated means is initially energized thesame initially energizes said first coil for opening said first valvemeans while maintaining said second coil in a condition to preventopening of said second valve means, said electrically operated meanshaving electrically operated ignition means which when subsequentlyenergized to ignition condition is adapted to cause energizing of saidsecond coil to open said second valve means while holding said firstvalve means in its opened position, said electrically operated meanshaving a time delay means which is adapted to terminate the operation ofsaid control system if said second valve means is not opened in apredetermined time period after said electrically operated means isinitially operated, said electrically operated means having twoelectrical power source leads, said time delay means comprising anelectrical switch for effectively connecting and disconnecting saidpower source leads to and from said first coil, said electricallyoperated means being adapted to place said first coil across said powersource leads when said electrically operated means is initiallyenergized to cause opening of said first valve means and to start saidpredetermined time period for said time delay means, said time delaymeans having an electrical heater for opening said time delay switchwhen said heater reaches a predetermined temperature, said electricallyoperated means having a switch means which places said heater acrosssaid power source leads when said electrically operated means isinitially energized and when said ignition means is not at ignitioncondition, said switch means having means for sensing the condition ofsaid ignition means whereby when said sensing means senses a nonignitioncondition of said ignition means said switch means is in one positionthereof and when said switch means senses an ignition condition of saidignition means said switch means is in another position thereof.

20. An electrical control system as set forth in claim 19, said switchmeans when in said one position thereof placing said ignition means andsaid first coil in parallel relation across said power source leads.

21. An electrical control system as set forth in claim 19, said switchmeans when in said one position thereof placing said first coil and saidheater in parallel relation across said power source leads.

22. An electrical control system as set forth in claim 21, said switchmeans when in said one position thereof also effectively shunting outsaid second coil from said power source leads.

23. An electrical control system as set forth in claim 19, said switchmeans when in said other position thereof placing said first and secondcoils in series across said power source leads while disconnecting saidignition means from said power source leads.

24. A n electrical control system as set forth in claim 22, said switchmeans when in said other position thereof placing said first coil andsaid heater in parallel relation with said parallel circuit being placedin series with said second coil across said power source leads.

1. In a fuel control system having a source of fuel adapted to beinterconnected by conduit means to a burner means, the improvementcomprising a first valve means in said conduit means for controllingfuel flow therethrough, a second valve means in said conduit means forcontrolling fuel flow therethrough and being disposed intermediate saidfirst valve means and said burner means, and electrically operated meansoperatively interconnected to said valve means so that when saidelectrically operated means is initially energized the same initiallyopens said first valve means while maintaining said second valve meansin its closed position to prevent fuel flow to said burner means, saidelectrically operated means having electrically operated ignition meanswhich when subsequently energized to ignition condition causes openingof said second valve means while holding said first valve means in itsopened position and terminating the effective operation of said ignitionmeans whereby said ignition means ignites fuel issuing from said burnermeans, said electrically operated means having a time delay meanseffectively responsive only to an ineffective operation of said ignitionmeans which will terminate the operation of said control system if saidsecond valve means is not opened in a predetermined time period aftersaid electrically operated means is initially operated.
 2. In a fuelcontrol system as set forth in claim 1, said electrically operated meanshaving a first solenoid coil for operating said first valve means and asecond solenoid coil for operating said second valve means.
 3. In a fuelcontrol system as set forth in claim 2, said electrically operated meanshaving an electrical power source and having switch means placing saidfirst coil across said power source when said electrically operatedmeans is initially energized to cause opening of said first valve means.4. In a fuel control system as set forth in claim 3, said switch meanseffectively shunting out said second coil from said power source whensaid switch means initially places said first coil across said powersource whereby said second valve means remains closed.
 5. In a fuelcontrol system having a source of fuel adapted to be interconnected byconduit means to a burner means, the improvement comprising a firstvalve means in said conduit means for controlling fuel flowtherethrough, a second valve means in said conduit means for controllingfuel flow therethrough and being disposed intermediate said first valvemeans and said burner means, and electrically operated means operativelyinterconnected to said valve means so that when said electricallyoperated means is initially energized the same initially opens saidfirst valve means while maintaining said second valve means in itsclosed position to prevent fuel flow to said burner means, saidelectrically operated means having electrically operated ignition meanswhich when subsequently energized to ignition condition causes openingof said second valve means while holding said first valve means in itsopened position whereby said ignition means ignites fuel issuing fromsaid burner means, said electrically operated means having a time delaymeans which will terminate the operation of said control system if saidsecond valve means is not opened in a predetermined time period aftersaid electrically operated means is initially operated, saidelectrically operated meanS having a first solenoid coil for operatingsaid first valve means and a second solenoid coil for operating saidsecond valve means, said electrically operated means having anelectrical power source and having switch means placing said first coilacross said power source when said electrically operated means isinitially energized to cause opening of said first valve means, saidswitch means effectively shunting out said second coil from said powersource when said switch means initially places said first coil acrosssaid power source whereby said second valve means remains closed, saidswitch means being adapted to place said first and second coils inseries across said power source when said ignition means is subsequentlyenergized to ignition condition whereby said opened first and secondvalve means permit fuel to issue from said burner means and be ignitedby said ignition means.
 6. In a fuel control system having a source offuel adapted to be interconnected by conduit means to a burner means,the improvement comprising a first valve means in said conduit means forcontrolling fuel flow therethrough, a second valve means in said conduitmeans for controlling fuel flow therethrough and being disposedintermediate said first valve means and said burner means, andelectrically operated means operatively interconnected to said valvemeans so that when said electrically operated means is initiallyenergized the same initially opens said first valve means whilemaintaining said second valve means in its closed position to preventfuel flow to said burner means, said electrically operated means havingelectrically operated ignition means which when subsequently energizedto ignition condition causes opening of said second valve means whileholding said first valve means in its opened position whereby saidignition means ignites fuel issuing from said burner means, saidelectrically operated means having a time delay means which willterminate the operation of said control system if said second valvemeans is not opened in a predetermined time period after saidelectrically operated means is initially operated, said electricallyoperated means having a first solenoid coil for operating said firstvalve means and a second solenoid coil for operating said second valvemeans, said electrically operated means having an electrical powersource and having switch means placing said first coil across said powersource when said electrically operated means is initially energized tocause opening of said first valve means, said switch means effectivelyshunting out said second coil from said power source when said switchmeans initially places said first coil across said power source wherebysaid second valve means remains closed, said switch means being adaptedto place said first and second coils in series across said power sourcewhen said ignition means is subsequently energized to ignition conditionwhereby said opened first and second valve means permit fuel to issuefrom said burner means and be ignited by said ignition means, saidswitch means placing said ignition means in parallel with said firstcoil across said power source when said electrically operated means isinitially energized and said ignition means is not at ignitioncondition.
 7. In a fuel control system as set forth in claim 6, saidswitch means disconnecting said ignition means from said power sourcewhen said ignition means reaches ignition condition.
 8. In a fuelcontrol system as set forth in claim 1, said electrically operated meanshaving an electrical power source and first and second solenoid coilsfor respectively operating said first and second valve means, said timedelay means comprising an electrical switch for connecting anddisconnecting said power source to and from said first coil, saidelectrically operated means placing said first coil across said powersource when said electrically operated means is initially energized tocause opening of said first valve means and to start said predeterminEdtime period for said time delay means.
 9. In a fuel control systemhaving a source of fuel adapted to be interconnected by conduit means toa burner means, the improvement comprising a first valve means in saidconduit means for controlling fuel flow therethrough, a second valvemeans in said conduit means for controlling fuel flow therethrough andbeing disposed intermediate said first valve means and said burnermeans, and electrically operated means operatively interconnected tosaid valve means so that when said electrically operated means isinitially energized the same initially opens said first valve meanswhile maintaining said second valve means in its closed position toprevent fuel flow to said burner means, said electrically operated meanshaving electrically operated ignition means which when subsequentlyenergized to ignition condition causes opening of said second valvemeans while holding said first valve means in its opened positionwhereby said ignition means ignites fuel issuing from said burner means,said electrically operated means having a time delay means which willterminate the operation of said control system if said second valvemeans is not opened in a predetermined time period after saidelectrically operated means is initially operated, said electricallyoperated means having an electrical power source and first and secondsolenoid coils for respectively operating said first and second valvemeans, said time delay means comprising an electrical switch forconnecting and disconnecting said power source to and from said firstcoil, said electrically operated means placing said first coil acrosssaid power source when said electrically operated means is initiallyenergized to cause opening of said first valve means and to start saidpredetermined time period for said time delay means, said time delaymeans having an electrical heater for opening said time delay switchwhen said heater reaches a predetermined temperature.
 10. In a fuelcontrol system as set forth in claim 9, said electrically operated meanshaving a switch means that places said heater across said power sourcewhen said electrically operated means is initially energized and saidignition means is not at ignition condition.
 11. In a fuel controlsystem as set forth in claim 10, said switch means having means forsensing the condition of said ignition means whereby when said sensingmeans senses a nonignition condition of said ignition means said switchmeans is in one position thereof and when said switch means senses anignition condition of said ignition means said switch means is inanother position thereof.
 12. In a fuel control system as set forth inclaim 11, said switch means when in said one position thereof placingsaid ignition means and said first coil in parallel relation across saidpower source.
 13. In a fuel control system as set forth in claim 11,said switch means when in said one position thereof placing said firstcoil and said heater in parallel relation across said power source. 14.In a fuel control system as set forth in claim 11, said switch meanswhen in said other position thereof placing said first and second coilsin series across said power source while disconnecting said ignitionmeans from said power source.
 15. In a fuel control system as set forthin claim 14, said switch means when in said other position placing saidfirst coil and said heater in parallel relation with said parallelcircuit being placed in series with said second coil across said powersource.
 16. An electrical control system for a fuel-burning apparatus orthe like comprising a first solenoid coil for operating a first valvemeans, a second solenoid coil for operating a second valve means, andelectrically operated means operatively interconnected to said coils sothat when said electrically operated means is initially energized thesame initially energizes said first coil for opening said first valvemeans while maintaining said second coil in a cOndition to preventopening of said second valve means, said electrically operated meanshaving electrically operated ignition means which when subsequentlyenergized to ignition condition is adapted to cause energizing of saidsecond coil to open said second valve means while holding said firstvalve means in its opened position, said electrically operated meanshaving a time delay means which is adapted to terminate the operation ofsaid control system if said second valve means is not opened in apredetermined time period after said electrically operated means isinitially operated, said electrically operated means having twoelectrical power source leads and having switch means adapted to placesaid first coil across said power source leads when said electricallyoperated means is initially energized to cause opening of said firstvalve means, said switch means effectively shunting out said second coilfrom said power source when said switch means initially places saidfirst coil across said power source leads whereby said second valvemeans remains closed, said switch means being adapted to place saidfirst and second coils in series across said power source leads whensaid ignition means is subsequently energized to ignition conditionwhereby said open first valve and second valve means will permit fuel toissue from a burner means of said apparatus and be ignited by saidignition means.
 17. An electrical control system for a fuel-burningapparatus or the like comprising a first solenoid coil for operating afirst valve means, a second solenoid coil for operating a second valvemeans, and electrically operated means operatively interconnected tosaid coils so that when said electrically operated means is initiallyenergized the same initially energizes said first coil for opening saidfirst valve means while maintaining said second coil in a condition toprevent opening of said second valve means, said electrically operatedmeans having electrically operated ignition means which whensubsequently energized to ignition condition is adapted to causeenergizing of said second coil to open said second valve means whileholding said first valve means in its opened position, said electricallyoperated means having a time delay means which is adapted to terminatethe operation of said control system if said second valve means is notopened in a predetermined time period after said electrically operatedmeans is initially operated, said electrically operated means having twoelectrical power source leads and having switch means adapted to placesaid first coil across said power source leads when said electricallyoperated means is initially energized to cause opening of said firstvalve means, said switch means effectively shunting out said second coilfrom said power source when said switch means initially places saidfirst coil across said power source leads whereby said second valvemeans remains closed, said switch means being adapted to place saidfirst and second coils in series across said power source leads whensaid ignition means is subsequently energized to ignition conditionwhereby said open first valve and second valve means will permit fuel toissue from a burner means of said apparatus and be ignited by saidignition means, said switch means being adapted to place said ignitionmeans in parallel with said first coil across said power source leadswhen said electrically operated means is initially energized and saidignition means is not at ignition condition.
 18. An electrical controlsystem as set forth in claim 17, said switch means disconnecting saidignition means from said power source when said ignition means reachesignition condition.
 19. An electrical control system for a fuel-burningapparatus or the like comprising a first solenoid coil for operating afirst valve means, a second solenoid coil for operating a second valvemeans, and electrically operated means operatively interconnected tosaid coils so that when said electrically opErated means is initiallyenergized the same initially energizes said first coil for opening saidfirst valve means while maintaining said second coil in a condition toprevent opening of said second valve means, said electrically operatedmeans having electrically operated ignition means which whensubsequently energized to ignition condition is adapted to causeenergizing of said second coil to open said second valve means whileholding said first valve means in its opened position, said electricallyoperated means having a time delay means which is adapted to terminatethe operation of said control system if said second valve means is notopened in a predetermined time period after said electrically operatedmeans is initially operated, said electrically operated means having twoelectrical power source leads, said time delay means comprising anelectrical switch for effectively connecting and disconnecting saidpower source leads to and from said first coil, said electricallyoperated means being adapted to place said first coil across said powersource leads when said electrically operated means is initiallyenergized to cause opening of said first valve means and to start saidpredetermined time period for said time delay means, said time delaymeans having an electrical heater for opening said time delay switchwhen said heater reaches a predetermined temperature, said electricallyoperated means having a switch means which places said heater acrosssaid power source leads when said electrically operated means isinitially energized and when said ignition means is not at ignitioncondition, said switch means having means for sensing the condition ofsaid ignition means whereby when said sensing means senses a nonignitioncondition of said ignition means said switch means is in one positionthereof and when said switch means senses an ignition condition of saidignition means said switch means is in another position thereof.
 20. Anelectrical control system as set forth in claim 19, said switch meanswhen in said one position thereof placing said ignition means and saidfirst coil in parallel relation across said power source leads.
 21. Anelectrical control system as set forth in claim 19, said switch meanswhen in said one position thereof placing said first coil and saidheater in parallel relation across said power source leads.
 22. Anelectrical control system as set forth in claim 21, said switch meanswhen in said one position thereof also effectively shunting out saidsecond coil from said power source leads.
 23. An electrical controlsystem as set forth in claim 19, said switch means when in said otherposition thereof placing said first and second coils in series acrosssaid power source leads while disconnecting said ignition means fromsaid power source leads.
 24. A n electrical control system as set forthin claim 22, said switch means when in said other position thereofplacing said first coil and said heater in parallel relation with saidparallel circuit being placed in series with said second coil acrosssaid power source leads.